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Now select 'Tag Change' click the 'new Tag+' icon at the bottom of the window shown below and create a new Tag Change Script called 'Publish Script'.

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Set After setting the name of the script and then select a tag path.  In this case we're using an MQTT Engine tag from an emulated device.a tag in the default tag provider called 'MyTriggerTag' as shown below.

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Now select the 'Script' tab near the top.  In it, type the following line:

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When complete, the script should look something like this.  Now click OK.

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Finally, save and publish the project.  At this point every time this tags value, quality, or timestamp changes it will result in a MQTT message being published on topic 'a/b/c' with a payload of 'hello world'.

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